Whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable – if anything is excellent or praiseworthy – think about such things.

Philippians 4:8 NIV

It's not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done better. The credit belongs to the man who is actually in the arena ... who, at best, knows in the end the triumph of great achievement, and who, at the worst, if he fails, at least fails while daring greatly. So that his place will never be with those cold timid souls who know neither victory or defeat. 

Theodore Roosevelt